🔧 WRX - Power Steering Pump Replacement

Your WRX uses electric power steering (EPS), so it does not have a hydraulic power steering pump, belt-driven pulley, or power steering fluid reservoir to replace. If you’re having heavy steering, a warning light, or a whining noise, the fix is usually in the EPS system (battery/charging, fuses, wiring, steering rack/motor, or an EPS code).

Before I point you to the correct replacement procedure, answer these 2 quick questions: (1) Do you have a power steering/EPS warning light on the dash? (2) Is there any fluid leak under the front of the car?

Difficulty Level: Beginner (checks) / Advanced (rack replacement) | Estimated Time: 0.5-1.0 hours (checks)

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⚠️ Safety & Precautions

• ⚠️ Support the car with jack stands before going underneath.
• ⚠️ Keep hands clear of the steering linkage while someone turns the wheel.
• ⚠️ If unplugging EPS connectors, disconnect the negative battery terminal first to prevent accidental EPS activation.
• ⚠️ After any steering/suspension work, a wheel alignment is required.

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🔧 Required Tools

You'll need the following tools for this repair:

• OBD2 scan tool capable of reading Subaru ABS/EPAS codes (specialty)
• Digital multimeter
• 10mm socket
• 12mm socket
• Ratchet
• 3/8" torque wrench
• Flat trim tool
• Floor jack (rated 2-ton minimum)
• Jack stands (rated 2-ton minimum)
• Wheel chocks
• Safety glasses
• Mechanic gloves
• Work light

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• No parts required (for EPS checks) - Qty: 0
• Battery terminal anti-corrosion pads - Qty: 1
• Battery terminal cleaner spray - Qty: 1

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📋 Before You Begin

• Park on level ground, set the parking brake, and place wheel chocks behind the rear wheels.
• Turn the ignition fully OFF and remove the key (if applicable).
• If you’ll unplug any EPS/steering connectors, disconnect the battery: use a 10mm socket to remove the negative terminal and isolate it so it can’t spring back.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Confirm it’s EPS (no pump/fluid)

• Open the hood and look for a power steering fluid reservoir—your WRX should not have one because it’s EPS.
• If you see a small electric motor and wiring at the steering rack area (down low), that’s the EPS assist unit (not a pump).

Step 2: Check battery health and charging (common EPS cause)

• Use a digital multimeter across the battery terminals with the engine OFF; you want roughly ~12.6V on a healthy, fully charged battery.
• Start the engine and check again with the digital multimeter; charging is typically around ~13.5–14.8V.
• Low voltage can disable steering assist.

Step 3: Inspect battery terminals and grounds

• Use a 10mm socket to loosen and remove the negative battery terminal.
• Clean any corrosion (white/green buildup) using battery terminal cleaner spray and a terminal brush (part of many cleaning kits).
• Reinstall the terminal and tighten with a 10mm socket until snug (do not overtighten).

Step 4: Check EPS-related fuses

• Use a flat trim tool to open the interior fuse access panel (driver side lower dash area).
• Check the steering/EPS-related fuses (the fuse box cover diagram will label them).
• If a fuse is blown, replace with the same amperage rating only.

Step 5: Scan for EPS/ABS codes (best next step)

• Plug in an OBD2 scan tool capable of reading Subaru ABS/EPAS codes (specialty).
• Read codes from ABS/VDC and any steering/EPS module your scanner can access.
• Write down the exact code numbers and descriptions.
• The code tells you what to replace.

Step 6: Quick visual inspection at the steering rack area

• Lift the front of the car with a floor jack (rated 2-ton minimum) and support with jack stands (rated 2-ton minimum).
• Use a work light to inspect the steering rack electrical connector(s) and harness for damage, looseness, or water intrusion.
• If you see an unplugged connector, reconnect it firmly until it clicks.

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✅ After Repair

• Start the car and turn the steering wheel lock-to-lock slowly in a safe area to confirm assist is back and there are no abnormal noises.
• Re-scan with the OBD2 scan tool and see which codes return immediately.
• If the EPS warning light stays on or steering is still heavy, reply with the exact code(s); the next step may be replacing the steering rack/EPS motor assembly (advanced) and then getting an alignment.

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💰 DIY vs Shop Cost

Shop Cost: ₹1,000-₹4,000 (diagnosis/checks) or ₹45,000-₹1,20,000 (rack/EPS assembly replacement + alignment, varies by parts)

DIY Cost: ₹0-₹2,000 (cleaning supplies) or ₹35,000-₹90,000 (parts only if rack/EPS assembly is needed)

You Save: ₹1,000-₹30,000 by doing it yourself!

Shop labor rates vary but typically run ₹800-₹2,000/hour. This repair takes a shop approximately 0.5-1.0 hours for checks.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.